f#

问题 I have some understanding of the difference between private members and let bindings. It may help me clarify my doubts understanding why something like this is not possible type B () = inherit A () let doSomething () = base.CallToA () Is it to prevent partially constructed objects or some leaks during construction? 回答1: The base keyword is only really needed to call a base-class implementation of a virtual method. That is the only case where you need base because you cannot invoke the method

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . .NET comes with some built in collections (stack, queue, dictionary, list etc.) but others common collections, like priority queues, are missing. There are many third party collection libraries on NuGet but I was wondering if there is an official Microsoft one (like the BCL immutable collections now called

问题 So I am experiencing some inconsistent behavior in my regex My regex: (?<=test\\\\)(.*)(?=\",) The input string: "test.exe /c echo teststring > \\\\.\\test\\teststring", When I run this in https://Regex101.com I get the value teststring however when I run this in F# Regex.Match(inputString, "(?<=test\\\\)(.*)(?=\",)") I get \teststring back. My goal is to get just teststring . I'm not sure what I'm doing wrong. 回答1: I had success using triple quoted strings. Then only the regex escapes need

问题 In the following code, both do! ag.AsyncAdd (Some i) or ag.AsyncAdd (Some i) (in the function enqueue() ) work. What's the difference between them? It seems do! ... will make enqueuing and dequeuing calls more mixed? How? open FSharpx.Control let test () = let ag = new BlockingQueueAgent<int option>(500) let enqueue() = async { for i = 1 to 15 do // ag.AsyncAdd (Some i) // works too do! ag.AsyncAdd (Some i) printfn "=> %d" i } async { do! [ for i = 1 to 10 do yield enqueue() ] |> Async

问题 I have a set of records: type Person = { Name : string Age : int } let oldPeople = set [ { Name = "The Doctor"; Age = 1500 }; { Name = "Yoda"; Age = 900 } ] Unlike the hardcoded example above, the set of data actually comes from a data source (over which I have very little control). Now I need to subtract a set of data from another data source. In general, the data in this second source matches, but occasionally there is a difference in captialization: let peopleWhoAreConfusedAboutTheirAge =

问题 I am using the R Type Provider like so in the REPL #r "../packages/FSharp.Data.2.2.0/lib/net40/FSharp.Data.dll" open FSharp.Data [<Literal>] let uri = "https://reddoggabtest-secondary.table.core.windows.net/TestTelemetryData0?tn=TestTelemetryData0&sv=2014-02-14&si=GabLab&sig=GGc%2BHEa9wJYDoOGNE3BhaAeduVOA4MH8Pgss5kWEIW4%3D" type CarTelemetry = XmlProvider<uri> let carTelemetry = CarTelemetry.Load(uri) #r "C:/Program Files (x86)/Reference Assemblies/Microsoft/Framework/.NETFramework/v4.5.1

问题 My goal is to be able to generate data for a Google Visualizations on the server, and then pass it to the client as java script so that it can be rendered as a line chart. My example below compiles correctly, but produces an error when rendered in a browser. What do I need to do to get the DataCommon object to render correctly as java script, after it has been built on the server? namespace Website open System type Action = | Test module Page = open System.Web open IntelliFactory.WebSharper

问题 can somebody teach me how to make a tree from a given data using F#? for example: a list of numbers or a list of city's name and etc . I don't have any clue how to make tree in F#, need help here :) for example: the input is from run-time, assume it's from a text file: a list name of city the output result: graph 回答1: Wikipedia has a list of common ways graph data is represented which should help you if you're trying to load graph data from a file. Once you have loaded the data search Stack

问题 I am kinda new to F# and I'm trying to write a simple program that reads a mathematical expression and calculates it. I was successfully able to calculate expressions like: "5+3 *3 - 1/2" , "10 + 50 /50" etc. As this is being fairly simple and done by straightforward recursion, I wanted to take it to the next level using other mathematical functions (cos,sin etc.) but . . . I stumbled upon parentheses as i can't get an idea of how to recurse on patterns such as "((5+3) * 5) - (4-5)" because

问题 When in a separate Fsharp project in a SomeLib.fs file the following code is compiled: namespace SomeNameSpace type SomeType = member this.SomeMember = "Some member" and you want to reference and use this type in a script file like: #I @"c:/pathToDll/" #r "SomeLib.dll" This is not possible, although the path to the dll is correct and I checked everything. Also when the SomeLib.fs file is in the same project and referenced by #load, you still cannot open the namespace. I know you can put the